Error detection/correction and fault detection/recovery – Data processing system error or fault handling – Reliability and availability
Reexamination Certificate
2003-09-09
2008-10-14
Duncan, Marc (Department: 2113)
Error detection/correction and fault detection/recovery
Data processing system error or fault handling
Reliability and availability
C714S012000
Reexamination Certificate
active
07437605
ABSTRACT:
An apparatus provides hot standby operation with normal and standby processors, each of which includes vital inputs electrically interconnected with the vital inputs of the other processor, vital outputs, and an application routine inputting the vital inputs and outputting the vital outputs. Communication ports communicate with communication ports of the other processor. A health routine provides a health status after communication is established with the other processor. A vital relay includes an input controlled by a vital output and an output to a vital input of the other processor. A synchronization routine provides a synchronization status through the communication ports. The application routine outputs the vital outputs when the synchronization status is set. The standby processor includes a reset routine, which resets the standby processor when the health status of that processor is not provided. A vital “OR” circuit outputs from the vital outputs of the normal and standby processors.
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Duncan Marc
Eckert Seamans Cherin & Mellott , LLC
Houser Kirk D.
Union Switch & Signal Inc.
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